Lensing from the Light-Traces-Mass Map of MS1224+20

R. G. Carlberg; H. K. C. Yee; E. Ellingson

doi:10.1086/174975

paper

Lensing from the Light-Traces-Mass Map of MS1224+20

arXiv:astro-ph/9402036 · doi:10.1086/174975

Abstract

The MS1224+20 cluster of galaxies is a high luminosity X-ray source at z=0.325. To compare the lensing mass to the virial mass we have completed a uniform, high precision redshift survey over a field of $7\arcm\times9\arcm$, obtaining 75 redshifts. The velocity dispersion of 30 cluster galaxies is $775$ \kms\ and the projected harmonic radius is 0.32 \hmpc. The virial mass is $2.1\times 10^{14} h^{-1} \msun$. Correcting for faint cluster galaxies without redshifts and allowing for a modest evolution in the galaxy luminosity function gives a current epoch mass-to-light ratio $M/L_V(0)=255h \msun/\lsun$. The same field contains a $z = 0.225$ cluster with $σ_{v} ≃ 500$ \kms, and a group at $z = 0.412$ with $σ_{v} ≃ 400$ \kms. The clusters' gravitational field induces image ellipticities that are calculated from the light-traces-mass density distribution and compared to the observed average tangential distortions from Fahlman \et (1994). Between 1.5 and 3 virial radii, the observed lensing distortions are $4 \pm 2$ times stronger than the light-traces-mass model and the virial M/L predict.

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Lensing from the Light-Traces-Mass Map of MS1224+20

Abstract

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